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{ "id": 2196962, "url": "http://patchwork.ozlabs.org/api/covers/2196962/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-tegra/cover/20260216181002.3475421-1-dianders@chromium.org/", "project": { "id": 21, "url": "http://patchwork.ozlabs.org/api/projects/21/?format=api", "name": "Linux Tegra Development", "link_name": "linux-tegra", "list_id": "linux-tegra.vger.kernel.org", "list_email": "linux-tegra@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260216181002.3475421-1-dianders@chromium.org>", "list_archive_url": null, "date": "2026-02-16T18:09:37", "name": "[v3,00/15] mailbox: Stop sending NULL mailbox messages", "submitter": { "id": 9763, "url": "http://patchwork.ozlabs.org/api/people/9763/?format=api", "name": "Douglas Anderson", "email": "dianders@chromium.org" }, "mbox": "http://patchwork.ozlabs.org/project/linux-tegra/cover/20260216181002.3475421-1-dianders@chromium.org/mbox/", "series": [ { "id": 492341, "url": "http://patchwork.ozlabs.org/api/series/492341/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-tegra/list/?series=492341", "date": "2026-02-16T18:09:37", "name": "mailbox: Stop sending NULL mailbox messages", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/492341/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2196962/comments/", "headers": { "Return-Path": "\n <linux-tegra+bounces-11959-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-tegra@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=chromium.org header.i=@chromium.org header.a=rsa-sha256\n header.s=google header.b=hb9r7TO9;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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Despite this, there are a\nnumber of drivers that pass NULL.\n\nIt is plausible that some of the drivers passing NULL may have been\ntaking advantage of the quirks of the mailbox core. Specifically, they\nmay have been taking advantage that calling \"tx_done\" wasn't truly\nnecessary for NULL messages (it was a noop) or that NULL messages were\npassed onto the mailbox controller right away without queuing.\n\nThis series introduces a new API call: mbox_ring_doorbell(). The new\nAPI call tries to mimic the specific quirks that were helpful in the\nold behavior and it's expected to be a nearly drop-in replacement.\n\nThere are some subtle differences between the new call and the old\nbehavior, but it's expected that all of these differences are only for\ncases where the old behavior made little sense. The description of the\nfirst patch details these differences.\n\nThe series attempts to convert all in-tree users to stop passing NULL\nfor mssg. As per above, there are some slight differences in behavior.\nIf any of the patches are causing problems, they can safely be\nreverted while debugging the problems. Eventually, all code should be\nconverted over to stop passing NULL mssg.\n\nChanges in v3:\n- Suggest mbox_ring_doorbell in the warning message\n- Updated patch description based on Cristian's response.\n\nChanges in v2:\n- Instead of just documenting NULL, introduce a new function\n\nDouglas Anderson (15):\n mailbox: Deprecate NULL mbox messages; Introduce mbox_ring_doorbell()\n ACPI: PCC: Use mbox_ring_doorbell() instead of NULL message\n firmware: arm_scmi: Use mbox_ring_doorbell() instead of NULL message\n firmware: imx-dsp: Use mbox_ring_doorbell() instead of NULL message\n firmware: tegra: bpmp: Use mbox_ring_doorbell() instead of NULL\n message\n irqchip/qcom-mpm: Use mbox_ring_doorbell() instead of NULL message\n remoteproc: xlnx: Use mbox_ring_doorbell() instead of NULL message\n rpmsg: qcom_glink_rpm: Use mbox_ring_doorbell() instead of NULL\n message\n rpmsg: glink: smem: Use mbox_ring_doorbell() instead of NULL message\n rpmsg: qcom_smd: Use mbox_ring_doorbell() instead of NULL message\n soc: qcom: aoss: Use mbox_ring_doorbell() instead of NULL message\n soc: qcom: smp2p: Use mbox_ring_doorbell() instead of NULL message\n soc: qcom: smsm: Use mbox_ring_doorbell() instead of NULL message\n soc: ti: wkup_m3_ipc: Use mbox_ring_doorbell() instead of NULL message\n drivers: firmware: xilinx: Use mbox_ring_doorbell() instead of NULL\n message\n\n drivers/acpi/acpi_pcc.c | 4 +-\n .../firmware/arm_scmi/transports/mailbox.c | 8 +-\n drivers/firmware/imx/imx-dsp.c | 2 +-\n drivers/firmware/tegra/bpmp-tegra186.c | 4 +-\n drivers/irqchip/irq-qcom-mpm.c | 2 +-\n drivers/mailbox/mailbox.c | 82 ++++++++++++++++++-\n drivers/remoteproc/xlnx_r5_remoteproc.c | 2 +-\n drivers/rpmsg/qcom_glink_rpm.c | 3 +-\n drivers/rpmsg/qcom_glink_smem.c | 3 +-\n drivers/rpmsg/qcom_smd.c | 13 +--\n drivers/soc/qcom/qcom_aoss.c | 3 +-\n drivers/soc/qcom/smp2p.c | 8 +-\n drivers/soc/qcom/smsm.c | 8 +-\n drivers/soc/ti/wkup_m3_ipc.c | 10 +--\n drivers/soc/xilinx/zynqmp_power.c | 2 +-\n include/linux/mailbox_client.h | 1 +\n include/linux/mailbox_controller.h | 4 +-\n 17 files changed, 108 insertions(+), 51 deletions(-)" }